Segment Reporting - Summary of Revenues Attributable to Services Provided by Company (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenue from External Customer [Line Items]
Revenues	$ 144,670	$ 143,714	$ 270,103	$ 260,292
Solid Waste Operations Collection [Member]
Revenue from External Customer [Line Items]
Revenues	63,685	60,636	121,536	113,962
Solid Waste Operations Disposal [Member]
Revenue from External Customer [Line Items]
Revenues	39,384	44,064	71,637	71,831
Solid Waste Operations Power Generation [Member]
Revenue from External Customer [Line Items]
Revenues	1,460	1,564	3,167	3,612
Solid Waste Operations Processing [Member]
Revenue from External Customer [Line Items]
Revenues	1,747	1,665	2,720	2,785
Solid Waste Operations [Member]
Revenue from External Customer [Line Items]
Revenues	106,276	107,929	199,060	192,190
Organics [Member]
Revenue from External Customer [Line Items]
Revenues	12,171	10,847	21,106	19,867
Customer Solutions [Member]
Revenue from External Customer [Line Items]
Revenues	13,407	13,476	26,483	26,479
Recycling [Member]
Revenue from External Customer [Line Items]
Revenues	$ 12,816	$ 11,462	$ 23,454	$ 21,756